Vehicle Control System Emergency Stop Position Determination
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Solution Overview
Problem
Existing automated driving systems are insufficient in determining appropriate stop positions for vehicles when a part of their functions fails, as they rely solely on image information, which may not account for limited motion performance and sensor limitations, leading to potential failure in arriving or stopping at intended positions.
Innovation Solution
A vehicle control system that acquires failure status information and determines a target stop position based on driving environment information, including map data, to ensure safe and effective emergency stops, even with failed functions, by identifying effective stop areas and prioritizing high-priority locations with suitable road conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the vehicle uses only image information to determine stop position, then the determination process is simple, but the vehicle may not be able to arrive or stop at the intended position when motion performance is limited due to failure
Solution Approach 1:
The system pre-acquires map information containing stop candidate areas and no-stopping areas before failure occurs. When failure happens, this pre-prepared spatial information is immediately utilized to determine a feasible stop position, avoiding the need for complex real-time analysis and enabling reliable stop position determination even with limited motion performance
Solution Approach 2:
Map information serves as an intermediary between the failure status and stop position determination. The map data provides pre-defined stop candidate areas that mediate the decision-making process, translating complex failure scenarios into manageable spatial choices without requiring complex real-time calculations
2Speed
If the vehicle determines stop position without considering failure status, then the control process is fast, but the determined position may be unreachable or unsafe given the limited motion performance
Solution Approach 1:
The system pre-acquires and stores map information including stop candidate areas and no-stopping areas before failure occurs. This preliminary preparation enables immediate determination of feasible stop positions when failure happens, maintaining fast response while ensuring the selected position is reachable with limited motion performance
Solution Approach 2:
The system changes the determination parameters by incorporating failure status information and vehicle performance characteristics into the stop position selection process. By adjusting which parameters are considered (using map-based stop candidate areas rather than standard parking positions), the system maintains fast decision-making while ensuring reachability
3Loss of time
If the vehicle stops at any available position, then the emergency response is immediate, but traffic flow may be disrupted and safety compromised
Solution Approach 1:
The system pre-acquires map information that identifies stop candidate areas specifically designated for emergency situations, distinguishing them from no-stopping areas. This preliminary spatial classification enables immediate selection of appropriate stop locations that minimize traffic disruption and safety risks while maintaining fast emergency response
Solution Approach 2:
The system applies different quality requirements to different spatial locations by using map information to identify specific stop candidate areas with appropriate characteristics (such as being away from no-stopping areas and suitable for emergency stops). This local differentiation ensures that emergency stops occur at locations that minimize harm to traffic flow and safety
Data Source
AI summary
A vehicle control system executes automated driving control that controls automated driving of a vehicle based on driving environment information indicating a driving environment for the vehicle. When a part of functions of the vehicle is failed during the automated driving, the vehicle control system executes emergency stop control that stops the vehicle. In the emergency stop control, the vehicle control system: acquires failure status information being information on the failed part of functions; determines, based on the failure status information and the driving environment information, a target stop position at which even the vehicle with the failed part of functions is able to arrive and stop by the automated driving; and executes the automated driving control such that the vehicle travels toward the target stop position to stop at the target stop position.